CAJ | 학술논문

针对突发GMSK混合信号的单通道盲分离问题,提出了一种基于逐幸存路径处理(PSP)的抗频偏盲分离算法.该算法通过在盲分离过程中对信道变化和频偏引起的相位变化分别进行跟踪,能大大提升算法对残余频偏的容忍能力.仿真表明,传统PSP算法能容忍的归一化频偏误差(相对符号速率)不大于2.0×10?4,而抗频偏算法在归一化频偏误差达1.5×10?2时仍然能收敛,且不需要对初始相位进行估计,同时分离性能相比理想条件下的PSP算法只下降了约1dB.
침대돌발GMSK혼합신호적단통도맹분리문제,제출료일충기우축행존로경처리(PSP)적항빈편맹분리산법.해산법통과재맹분리과정중대신도변화화빈편인기적상위변화분별진행근종,능대대제승산법대잔여빈편적용인능력.방진표명,전통PSP산법능용인적귀일화빈편오차(상대부호속솔)불대우2.0×10?4,이항빈편산법재귀일화빈편오차체1.5×10?2시잉연능수렴,차불수요대초시상위진행고계,동시분리성능상비이상조건하적PSP산법지하강료약1dB.
A per-survivor processing (PSP) based anti-frequency-offset algorithm was proposed for single-channel blind separation of burst GMSK mixed signals. The algorithm traces the phase changes caused by frequency offset and channel changes caused by other matters separately, which remarkably tones up the capacity against frequency offset. Simulation results show that the proposed algorithm can work well even when the unitary frequency offset (compared to symbol rate ) grows up to 1.5×10?2, while the traditional PSP algorithm needs the unitary frequency offset less than 2.0×10?4. Further-more, the proposed algorithm has no need for phase initialization, and a loss of only 1dB on performance can be achieved in comparison with the traditional PSP algorithm.